Environmental control of seed dormancy and germination in the short-lived Olimarabidopsis pumila (Brassicaceae) |
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| Authors: | AJ Tang MH Tian CL Long |
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| Institution: | 1. Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, PR China;2. Graduate School of Chinese Academy of Sciences, Beijing 100049, PR China;3. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, PR China;4. College of Life and Environmental Sciences, Central University for Nationalities, Beijing 100081, PR China;1. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran;2. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran;1. Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;2. Department of Chemical Informatics, University of Szeged, H-6725 Szeged, Hungary;3. Protein Modeling Group, Hungarian Academy of Sciences-ELTE, H-1117 Budapest, Hungary;4. Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Hungary;5. Department of Chemistry, Langelandsgade 140, Aarhus University, DK-8000 Aarhus C, Denmark;1. Department of Chemistry and Chemical Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China;2. State Grid Energy Conservation Service Co., Ltd., Beijing Biomass Energy Technology Center, Beijing 100052, China;3. Department of Paper and Bioprocess Engineering, SUNY College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210, United States;1. Islamic Azad University, Bandar Lengeh, Iran;2. Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran;3. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran;1. University of Belgrade, Department of Neurobiology, Institute for Biological Research—Sinisa Stankovic, 11 060 Belgrade, Serbia;2. University of Belgrade, Department for Life Sciences, Institute for Multidisciplinary Research, 11 030 Belgrade, Serbia;1. Merton College, University of Oxford, OX1 4JD Oxford, UK;2. Université de Montréal, Département de science politique, Canada;3. Universitat Autònoma de Barcelona, Spain |
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| Abstract: | The purpose of our study was to better understand seed germination ecology of the spring annual short-lived Olimarabidopsis pumila, which grows in the Gurbantonggut Desert, China. Seeds underwent after-ripening at 4, 20 ± 2 (room temperature) and 30 °C. After dormancy was broken, germination capacity was a function of temperature and presence of light. For the temperature range studied (4–30 °C), germination capacity was significantly higher between 15 and 25 °C than at temperatures above or below them. Alternating temperatures of 20/10, 25/10 and 25/15 °C were favorable for germination. Although GA3 did promote dark germination of seeds, GA3 did not replace light for germination. Seeds germinated to >75% if light exposure time was over 8 h and temperature and moisture conditions were favorable. Seeds were able to germinate at relatively low water potentials (83% at ?0.41 MPa), but decreasing water potentials produced detrimental effects on germination percentage and rate. Thus, dormancy characteristics and germination behavior of O. pumila seeds ensure that germination occurs in the desert only when soil moisture conditions are favorable for seedling establishment and survival. |
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